Garl otto dost



(No Model.)

6. 0. DOST. DEVICE PORSPHBRIG TURNING.

N0. 494,737 Patented Apr. 4, 1893.

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UNITED STATES PATENT OFFICE.

CARL OTTO DOST, OF MAGDEBURG, GERMANY.

DEVICE FOR SPHERIC TURNING.

SPECIFICATION forming part of Letters Patent No. 494,737, dated April 1, 1893.

Application filed April 19, 1392. Serial No. 429,765. (No model.)

To all whom it may concern.-

Be it known that I, CARL OTTO DOST, a subject of the Emperor of Germany, residing at Magdeburg-Neustadt, in Germany, have invented a certain new and useful Device for Spheric Turning, of which the following is a specification.

This invention relates to an attachmentfor spherical turning with a horizontal spindle, by means of which balls, hand-wheels and round portions of machinery with concave or convex surfaces can be turned on any lathe.

In the accompanying drawings Figure 1 is a front elevation of my improved round turning apparatus adjusted for turning a ball. Fig. 2, is a plan-view of the same. Fig. 3, is a side-view of the same. Fig. t, is a detail (sectional plan and front view) of the automatic stopping device. Fig. 5, is an elevation of the round turning device adjusted for turning a hand-wheel, and Fig. 6, is a similar View, showing the same adjusted for turning a grooved wheel, and Fig. 7, is a side-view of a modification of the standard used in the machine.

Similar letters of reference indicate corresponding parts.

To one end of the axle a the worm-wheel b is attached and to the other end the block 0. The slide-rest d of the block c-is arranged as a holder for the turning-tool s, which sliderest is adjusted by means of a spindle c". The axle a is horizontal and movably placed in the slide-rest f. The slide-rest f is adjustable by means of a spindle H on a vertical prismatic bearing of the standard h. This standard h is provided at its rear with a projection h, by means of which the whole apparatus can be inserted into the tool-holder of a lathe support, as shown in dotted lines in Fig. 1, like an ordinary turning-tool; or the said standard may be firmly screwed on the upper sliding-rest a of the lathe-support, as shown in Fig. 6; or the turning-attachment can be held by means of a special standard it on the support of the lathe, as shown in Fig. 7. If a ball is to be turned in this apparatus, the horizontal shaft a. is brought into the exact level of the lathe-centers e e by moving the same upward or downward in the standard It. By revolving the shaft (1. to the right or left, the tool f describes a circle, exactly concentric to the center of rotation, whereby the body inserted into the lathe is turned into a ball is. The tool 5 in this case stands above the lathe-center, or the shaft a and the size of the ball is regulated by the adjustment of the tool toward or from the shaft a. In order to fix this adjustment of the tool and thereby to produce any quantity of articles of exactly the same size, the spindle Z is inserted laterally in the block 0, which spindle is provided with two nuts 2'', which can be clamped firmly at any part of the spindle by being screwed one against the other. As soon as the toolend-position, a projection in fixed onthe toolcarrier at strikes against the stop thus formed by the nuts Z. The progressive movement of the tool for removing a continuous shaving on spherical bodies or the rotation of the shaft or is produced by the rotation of the worm g which engages the worm-wheel b, which rotation may be produced either by hand, by means of the handles placed on the square part of the shaft of the worm, as shown in Fig. 2, or still better and more easily by means of a ratchet-lever 11 on the shaft of the worm. This lever i is provided at its end with holes into one of which a chain or cord i is hooked, the other end of which is connected with an automatic feed-attachment, such as is usually provided on lathes. This cord or chain draws the lever upward in the direction of the arrow n, Fig. 3, and thus turns the worm of the worm-shaft with the block 0 and tool-carrier (1 respectively. If the chain is released, a weight suspended beneath draws the lever 2' back again in the direction of the arrow 0, but without turning the worm. This operation is repeated automatically and the turning-tool would, if still moved forward, finally reach the spindle carrying the ball if the machine would not be stopped by the operator or the further move ment automatically interrupted by a checking-device. Said checking-device is shown in Figs. 3 and 4. A wedge-shaped groove 5 is turned in the face of the worm-wheel 1? concentrically to its center and in the same a similarly shaped head of a screw 29 is inserted, and this screw serves to attach at a suitable part of the worm-wheel an angle-piece 19 provided with a set-screw 10' and a counter holder or carrier (1 has reached its allotted nut p If the apparatus has turned sofar that the ft-ool will shortly come in contact the same, as shown'in dotted linesin Fig, 3,

in consequence of which the pawl of the ratchet-lever cannot operateany further and the movement of the turning-wheel isinterrupted. Before commencing turning, the

set-screw p" onthe angle pieceip and the lat-7 ter itself are adjusted on the Worm-Wheelb' at the proper place obtained by-trialswmade by hand. For turning knobs or roundings for instance, =fo 1han o crank-wheels c T Fignthe tsha'f -1 ve ly adj usted s higho the --standa 1 t at i s cente dine coincidesaoxaotlywit theent ine i QIYQSS'L sect-ion of ,the z-round Jknob r ,-so that when theshatt a is turned 1 the tool s will describe a cirQula-rcourse around said knob r. For rninggro -ves in th rim o he lsasshown inr Fig. 6, the center lineof I the shaft acis errange as ificient y high a e t e. groove to b wm decnntil the aowall nadiu t Whichthe groove is: to hemmed out is obtained. The; cnttizngredge 1116130012111 est, howe er, i -thi "caseal ra-y sta d below the a a cen e l ne, while, as-Estatod: in aseot balls. o kn the Y uttingnedg (o I the "too s situat a ove the axial: center-line of the shaft a. The autoinatio starting .th aut ma os opp e device; for limiting t e work ng may al h mploy daa r s yd sc ibe Having thus {described ,my invention, 1,1 cl im; as neman desi t se r by etter Pate 1. ,Aturning apparatus by means of which ;t-,u-rning;workton concave or convex lines can be produced on an ordinary lathe, consisting of the spindle bearing f, the spindle a, the worm-wheel b on one end of the spindle, the prismatic guide 0 on the other end of the spindle, anadjustable tool-holder in the prismatic guide a and the standard h provided with means-for holding it on the lathe, substantially as set'forth.

2. In a round or spheric turning attachment, for lathe s,,the combination, with a spindle bearing, of a spindle in the same, awormwheel onsaid spindle, a worm engaging the worm-wheel and a ratchet and pawl for rotating the worn] ,-:,a dever marrying ;the pawl and :anautomaticstopyforsaidlever, substantial l as set; forth.

2 a wound o t leph nic a aurningl attao men t for" lat-hes, the. co mhinatiop wi th as pin die-bearing, of: a rotat-ive spindle in the-same, a tool-carrier supported from said spin dle, a a or qwheeloni th sp n derawo -mcnga t wo mr h a H 'ELFQhB Wh Q connect with: thewornn a swingingpatvl leverhaving p ess-si th mtoh t whee an m djustablestop on the worm swheel, oristopp ing t e wir ns-rawklever; subs antial y; set forth.

In testimony whereof I 'zhereuntosign my rialme, in the presence ofttwo.t'subscrihingwitnesses, this: 11th; day of March, 1 1892.

QARLriQ'I-ITO DOST.

Witnesses:

G. -Wms1s1vmmrn,

1W. EGGEL NG. 

